Abstract
The trap-state density in perovskite films largely determines the photovoltaic performance of perovskite solar cells (PSCs). Increasing the crystal grain size in perovskite films is an effective method to reduce the trap-state density. Here, we have added NH4SCN into perovskite precursor solution to obtain perovskite films with an increased crystal grain size. The perovskite with increased crystal grain size shows a much lower trap-state density compared with reference perovskite films, resulting in an improved photovoltaic performance in PSCs. The champion photovoltaic device has achieved a power conversion efficiency of 19.36%. The proposed method may also impact other optoelectronic devices based on perovskite films.
| Original language | English |
|---|---|
| Article number | 304 |
| Journal | Nanoscale Research Letters |
| Volume | 14 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2019 |
Bibliographical note
Publisher Copyright:© 2019, The Author(s).
Funding
The authors greatly acknowledge the Sichuan University and Ceshigou Analytical Testing Company for the measurement assistance. This work was supported by the National Natural Science Foundation of China under Grant Nos. 61874150, 61421002, and 61574029. This work was also partially supported by the University of Kentucky. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. The authors declare no competing financial interests.
| Funders | Funder number |
|---|---|
| Ceshigou Analytical Testing Company | |
| University of Kentucky | |
| National Natural Science Foundation of China (NSFC) | 61574029, 61874150, 61421002 |
| National Natural Science Foundation of China (NSFC) | |
| Sichuan University, Chengdu, Sichuan |
Keywords
- Crystalline
- NHSCN
- Perovskite solar cells
- Trap-state density
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
